Which of the statements below does not describe antigens?
A) Antigens only come from microbes.
B) The parts of antigen molecules that initiate immune responses are called epitopes or antigenic determinants.
C) Antigens can include proteins, nucleic acids, lipoproteins, glycoproteins, and certain large polysaccharides.
D) Antigens exhibit immunogenicity and reactivity.
A
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Which statement accurately compares the transmission speed of the different types of synapses?
A. Transmission at chemical synapses involves a brief synaptic delay, but electrical synapses are faster. B. Transmission at both chemical and electrical synapses involves a synaptic delay of approximately 1 millisecond. C. Transmission at electrical synapses involves a brief synaptic delay, but chemical synapses are faster. D. Electrical synapses have a constant delay of 1 millisecond, but chemical synaptic delays vary between 0.1 and 0.3 millisecond.
What causes the heart valves to open and close?
a. action potentials in vagus nerve b. electrical connection with vagus nerve c. differences in blood pressure across the valve
Increasing the voltage resulted in which of the following?
A) a decrease in the rate of propagation of the action potential B) an increase in the size of the action potential C) no change to the action potential D) an increase in the rate of propagation of the action potential
Which of the following is not composed of cuboidal epithelium?
A. The thick segment of the nephron loop B. The thin segment of the nephron loop C. The collecting duct D. The distal convoluted tubule E. The proximal convoluted tubule